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BBC's Quentin Sommerville is the first journalist to make it to Iraq's largest oil refinery, after the Iraqi army liberated it from Islamic State. Back in the summer, Iraq's army collapsed in the face of the so-called Islamic State. With the help of coalition airstrikes, Iraq has defeated IS forces in its first major battle for the strategic Baiji Oil Refinery in the north of the country.

Global demand for oil from OPEC next year will be less than expected because of weaker growth in consumption and the U.S. shale boom, the group said on Wednesday, pointing to an increasing supply surplus in 2015. In a monthly report, OPEC forecast demand for the group's oil will drop to 28.92 million barrels per day (bpd) in 2015, down 280,000 bpd from its previous expectation.

From the archives: A massive coal ash spill turned a Tennessee town into an "apocalyptic moonscape," Lesley Stahl reported in 2009. Is coal ash a hazardous waste or are the risks overstated? The coal industry is pushing for a solution that involves recycling.

Beyond Meat, maker of plant-based "chicken" and "ground beef," is aiming at the heart of the carnivorous market. Beyond Meat Founder Ethan Brown says their meatless products taste and feel like the real thing and they believe they can revolutionize the away we eat.

Using a new breed of seismic technology, Shell’s engineers discovered a whole untapped field – called Cardamom – hidden behind a vast salt deposit, 4 miles (6.4 km) below the sea floor. To reach its oil, Auger drilled one of the world’s longest wells.

Check out a clip from Bioenergy: America's Energy Future, a short film showcasing examples of bioenergy innovations across the biomass supply chain in the United States. The film highlights a few stories of individuals and companies who are passionate about addressing the challenges of developing a thriving bioeconomy.

Trying to understand the chemistry that turns plant material into the same energy-rich gasoline and diesel we put in our vehicles, researchers have discovered that water in the conversion process helps form an impurity which, in turn, slows down key chemical reactions.

Researchers are concerned about growing evidence that hormone-disrupting chemicals commonly found in antibacterial soaps can lead to developmental and reproductive problems in animals and potentially people.